197 lines
7.5 KiB
Python
197 lines
7.5 KiB
Python
# -*- coding: utf-8 -*-
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import mutagen
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import math
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import os
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import copy
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from media.monitor.exceptions import BadSongFile
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from media.monitor.log import Loggable
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import media.monitor.pure as mmp
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"""
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list of supported easy tags in mutagen version 1.20
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['albumartistsort', 'musicbrainz_albumstatus', 'lyricist', 'releasecountry',
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'date', 'performer', 'musicbrainz_albumartistid', 'composer', 'encodedby',
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'tracknumber', 'musicbrainz_albumid', 'album', 'asin', 'musicbrainz_artistid',
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'mood', 'copyright', 'author', 'media', 'length', 'version', 'artistsort',
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'titlesort', 'discsubtitle', 'website', 'musicip_fingerprint', 'conductor',
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'compilation', 'barcode', 'performer:*', 'composersort', 'musicbrainz_discid',
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'musicbrainz_albumtype', 'genre', 'isrc', 'discnumber', 'musicbrainz_trmid',
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'replaygain_*_gain', 'musicip_puid', 'artist', 'title', 'bpm',
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'musicbrainz_trackid', 'arranger', 'albumsort', 'replaygain_*_peak',
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'organization']
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"""
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airtime2mutagen = {
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"MDATA_KEY_TITLE" : "title",
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"MDATA_KEY_CREATOR" : "artist",
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"MDATA_KEY_SOURCE" : "album",
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"MDATA_KEY_GENRE" : "genre",
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"MDATA_KEY_MOOD" : "mood",
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"MDATA_KEY_TRACKNUMBER" : "tracknumber",
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"MDATA_KEY_BPM" : "bpm",
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"MDATA_KEY_LABEL" : "organization",
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"MDATA_KEY_COMPOSER" : "composer",
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"MDATA_KEY_ENCODER" : "encodedby",
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"MDATA_KEY_CONDUCTOR" : "conductor",
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"MDATA_KEY_YEAR" : "date",
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"MDATA_KEY_URL" : "website",
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"MDATA_KEY_ISRC" : "isrc",
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"MDATA_KEY_COPYRIGHT" : "copyright",
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}
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# Some airtime attributes are special because they must use the mutagen object
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# itself to calculate the value that they need. The lambda associated with each
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# key should attempt to extract the corresponding value from the mutagen object
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# itself pass as 'm'. In the case when nothing can be extracted the lambda
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# should return some default value to be assigned anyway or None so that the
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# airtime metadata object will skip the attribute outright.
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airtime_special = {
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"MDATA_KEY_DURATION" :
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lambda m: format_length(getattr(m.info, u'length', 0.0)),
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"MDATA_KEY_BITRATE" :
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lambda m: getattr(m.info, "bitrate", ''),
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"MDATA_KEY_SAMPLERATE" :
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lambda m: getattr(m.info, u'sample_rate', 0),
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"MDATA_KEY_MIME" :
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lambda m: m.mime[0] if len(m.mime) > 0 else u'',
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}
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mutagen2airtime = dict( (v,k) for k,v in airtime2mutagen.iteritems()
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if isinstance(v, str) )
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truncate_table = {
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'MDATA_KEY_GENRE' : 64,
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'MDATA_KEY_TITLE' : 512,
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'MDATA_KEY_CREATOR' : 512,
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'MDATA_KEY_SOURCE' : 512,
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'MDATA_KEY_MOOD' : 64,
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'MDATA_KEY_LABEL' : 512,
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'MDATA_KEY_COMPOSER' : 512,
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'MDATA_KEY_ENCODER' : 255,
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'MDATA_KEY_CONDUCTOR' : 512,
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'MDATA_KEY_YEAR' : 16,
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'MDATA_KEY_URL' : 512,
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'MDATA_KEY_ISRC' : 512,
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'MDATA_KEY_COPYRIGHT' : 512,
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}
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def format_length(mutagen_length):
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"""
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Convert mutagen length to airtime length
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"""
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t = float(mutagen_length)
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h = int(math.floor(t / 3600))
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t = t % 3600
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m = int(math.floor(t / 60))
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s = t % 60
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# will be ss.uuu
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s = str(s)
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seconds = s.split(".")
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s = seconds[0]
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# have a maximum of 6 subseconds.
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if len(seconds[1]) >= 6: ss = seconds[1][0:6]
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else: ss = seconds[1][0:]
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return "%s:%s:%s.%s" % (h, m, s, ss)
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def truncate_to_length(item, length):
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if isinstance(item, int): item = str(item)
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if isinstance(item, basestring):
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if len(item) > length: return item[0:length]
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else: return item
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class Metadata(Loggable):
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# TODO : refactor the way metadata is being handled. Right now things are a
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# little bit messy. Some of the handling is in m.m.pure while the rest is
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# here. Also interface is not very consistent
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@staticmethod
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def airtime_dict(d):
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"""
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Converts mutagen dictionary 'd' into airtime dictionary
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"""
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temp_dict = {}
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for m_key, m_val in d.iteritems():
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# TODO : some files have multiple fields for the same metadata.
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# genre is one example. In that case mutagen will return a list
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# of values
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assign_val = m_val[0] if isinstance(m_val, list) else m_val
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temp_dict[ m_key ] = assign_val
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airtime_dictionary = {}
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for muta_k, muta_v in temp_dict.iteritems():
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# We must check if we can actually translate the mutagen key into
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# an airtime key before doing the conversion
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if muta_k in mutagen2airtime:
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airtime_key = mutagen2airtime[muta_k]
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# Apply truncation in the case where airtime_key is in our
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# truncation table
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muta_v = \
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truncate_to_length(muta_v, truncate_table[airtime_key])\
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if airtime_key in truncate_table else muta_v
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airtime_dictionary[ airtime_key ] = muta_v
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return airtime_dictionary
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@staticmethod
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def write_unsafe(path,md):
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"""
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Writes 'md' metadata into 'path' through mutagen. Converts all
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dictionary values to strings because mutagen will not write anything
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else
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"""
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if not os.path.exists(path): raise BadSongFile(path)
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song_file = mutagen.File(path, easy=True)
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for airtime_k, airtime_v in md.iteritems():
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if airtime_k in airtime2mutagen:
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# The unicode cast here is mostly for integers that need to be
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# strings
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song_file[ airtime2mutagen[airtime_k] ] = unicode(airtime_v)
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song_file.save()
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def __init__(self, fpath):
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# Forcing the unicode through
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try : fpath = fpath.decode("utf-8")
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except : pass
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try : full_mutagen = mutagen.File(fpath, easy=True)
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except Exception : raise BadSongFile(fpath)
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self.path = fpath
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if not os.path.exists(self.path):
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self.logger.info("Attempting to read metadata of file \
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that does not exist. Setting metadata to {}")
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self.__metadata = {}
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return
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# TODO : Simplify the way all of these rules are handled right not it's
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# extremely unclear and needs to be refactored.
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self.__metadata = Metadata.airtime_dict(full_mutagen)
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# Now we extra the special values that are calculated from the mutagen
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# object itself:
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for special_key,f in airtime_special.iteritems():
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new_val = f(full_mutagen)
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if new_val is not None:
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self.__metadata[special_key] = new_val
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# Finally, we "normalize" all the metadata here:
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self.__metadata = mmp.normalized_metadata(self.__metadata, fpath)
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# Now we must load the md5:
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# TODO : perhaps we shouldn't hard code how many bytes we're reading
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# from the file?
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self.__metadata['MDATA_KEY_MD5'] = mmp.file_md5(fpath,max_length=100)
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def is_recorded(self):
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"""
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returns true if the file has been created by airtime through recording
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"""
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return mmp.is_airtime_recorded( self.__metadata )
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def extract(self):
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"""
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returns a copy of the metadata that was loaded when object was
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constructed
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"""
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return copy.deepcopy(self.__metadata)
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def utf8(self):
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"""
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Returns a unicode aware representation of the data that is compatible
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with what is spent to airtime
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"""
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return mmp.convert_dict_value_to_utf8(self.extract())
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